TITLE:
Frequency Synchronization in OFDM System
AUTHORS:
C. Geetha Priya, A. M. Vasumathi
KEYWORDS:
Orthogonal Frequency Division Multiplexing (OFDM); Additive White Gaussian Noise (AWGN); Carrier Frequency Offset (CFO); Constant Amplitude Zero Auto Correlation (CAZAC); Zadoff-Chu (ZC)
JOURNAL NAME:
Journal of Signal and Information Processing,
Vol.4 No.3B,
October
17,
2013
ABSTRACT: An accurate frequency synchronization method using the zadoff-chu (ZC)
constant envelop preamble is analyzed, and a new preamble weighted by
pseudo-noise sequence is used for orthogonal frequency division multiplexing
(OFDM) systems. Using this method, frequency offset estimator range is greatly
enlarged with no loss in accuracy. The
range of the frequency estimation is ±30 of subcarrier spacing using ZC sequence as preamble. Simulations in the MATLAB for
an AWGN channel show that the proposed method achieves superior performance to
existing techniques in terms of frequency accuracy and range.